I am sure most of you have heard about handsets supporting dual sim cards. That way you can have a personal and a business number in a single device. There is also a similar option using two lines in a single SIM, popular in Europe.
Now to add to the fun, dual IMSI supporting SIMs are coming out, most I have seen are from global roaming SIM providers, such as united-mobile.com or geosim.co.uk. These SIMs can connect to separate networks to provide better coverage as well. The ones I have seen carry a US and a UK number and effectively all incoming calls are free in US and most of Europe. Great news for